**Category 50 ****Example 1** - mental math

Only in answer choice B n increases 3 times with every 0.5 increase of m. In all other answer choices the increase is same each time.

**Category 51 ****Example 1** - mental math

Since the exponential decrease is by 7% during each time interval, x = 0.93. Since the decrease is every 3 years, in 15 years there will be 5 decreases. Hence, t = 5. Match the values of x and t with the answer choices.

**Category 51 ****Example 2 Question 1** - mental math

Since the increase is by 2% each year than the preceding year, x = 1.02. Match it with the answer choices.

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